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Proceedings Paper

Techniques to sort Bessel beams
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Paper Abstract

In this work we will present two techniques for the measurement of superimposed higher-order Bessel beams. In the first technique we will outline a simple approach using only a spatial light modulator and a Fourier transforming lens to decompose the OAM spectrum of an optical field. We test this approach on symmetric and non-symmetric superpositions of non-diffracting higher-order Bessel beams. Our second procedure consists of two refractive optical elements which perform a Cartesian to log-polar coordinate transformation, translating helically phased beams into a transverse phase gradient. By introducing two cylindrical lenses we can focus each of the azimuthal modes associated with each Bessel beam to a different lateral position in the Fourier plane, while separating the radial wave-vectors in the image-plane.

Paper Details

Date Published: 28 September 2013
PDF: 10 pages
Proc. SPIE 8843, Laser Beam Shaping XIV, 884306 (28 September 2013); doi: 10.1117/12.2026943
Show Author Affiliations
Angela Dudley, CSIR National Laser Ctr. (South Africa)
Thandeka Mhlanga, CSIR National Laser Ctr. (South Africa)
Stellenbosch Univ. (South Africa)
André McDonald, CSIR National Laser Ctr. (South Africa)
Filippus S. Roux, CSIR National Laser Ctr. (South Africa)
Martin Lavery, Univ. of Glasgow (United Kingdom)
Miles Padgett, Univ. of Glasgow (United Kingdom)
Andrew Forbes, CSIR National Laser Ctr. (South Africa)
Stellenbosch Univ. (South Africa)
Univ. of KwaZulu-Natal (South Africa)

Published in SPIE Proceedings Vol. 8843:
Laser Beam Shaping XIV
Andrew Forbes; Todd E. Lizotte, Editor(s)

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